Screening apparatus



Oct. 27, 1931.

C, A. GUSTAFSON SCREENING APPARATUS Filed June 4, 1928 3 Sheets-Sheet l I N VEA] TOR CARL A GUsTA FON Oct. 27, 1931. c. A. GUSTAFSON 5M WM 2 mF m M w m pV fir e. m A m m 3 A 5 m W W4 8 d wm OF S QM NM,

Oct. 27, 1931. c. A GUSTAFSON SCREENING APPARATUS Filed June 4, 1928 3 Sheets-Sheet 3 I/vvE/vToR CARL. A. GusTAFso/v ATTORNEYS Patented Get. 27, 1931 "N E STATES PATENT OFFICE CARL A. GUSTAFSON, 0F MINNEAPOLIS, MINNESOTA, ASSIGNOB, BY MESNE ASSIGN- MEETS, TO PIONEER GRAVEL EQUIPMENT MAITUFACTURING COMPANY, OF MINNE- APOLIS, IvIINNESOTA, A COEPORATION OF MINNESOTA SCREENING APPARATUS Application filed June 4,

This invention relates to new and useful improvements in screening apparatus, and more particularly to means for demountably securing a screen or material-separating member to its supporting frame.

An object of the present invention is to provide a novel clamping means for demountably securing a screen to its supporting me ans,whereby it may be quickly and readily detachedtherefrom for repairs, or to permit a new one to be substituted therefor, when necessary.

A further object of the invention is, to provide means for demountably securing a screen or other member to a pair of spacedsupporting members, comprising a plurality of inwardly turned hook elements secured to one of said supporting members, and a plurality of clamping'elements secured to the other supporting member and cooperating with the hookelements to demountably secure the screen to the frame members.

i A further object is to provide means for demountably securing a. screen or other mem her to a pair of spaced frame members, which comprises a plurality of inwardly turned hook elements secured to one of the frame members and having their lower portions bers at each end of the screen andv adapted to engage. the ends thereof and cooperating with said hook and clamping elements to demountably secure the screen to the supporting members.

Other objects of the invention willv appear from. the following description and accompanying drawings and will be pointed-out in the annexed claims. 7

In the accompanying drawings, there has beendisclosed a structure designed to carry out the various objects of the invention, but it is tobe understood that the invention is ript confined tothe exact featuresshown as various changes may be made within the scope of the claims which follow.

In the accompanying drawings forming part of this specification;

Figure 1 is a side elevation of one end of a gravel screening and crushing apparatus, showing the invention applied thereto;

Figure 2 is a longitudinalsectional View on the line 22 of Figure 3, showing the frame members to which the screen is demountably secured;

Figure 3 is a bottom view of the rear end portion of the screen;

Figure 4 is a cross sectional view on the line 4-4: of Figure 2, showing in dotted lines the screen partially removed from its supporting means;

Figure 5 is an enlarged detail elevational view showing one of the clamping elements;

Figure 6 is a similar view, showing one of the hook elements; and

Figure 7 is a detail sectional view on the line 77 of Figure 5, showing one of the clamping elements in clamping engagement with the screen.

In the selected embodiment of the invention. here shown, for purposes of disclosure, there is illustrated in Figure 1, a side elevation of one end of a gravel screening and crushing apparatus of the type shown in my Patent No; 1,611,026. This machine comprises a main frame 2 mounted upon carrying wheels 8 as shown. A super frame 4 is supported upon the main frame 2 and comprises a shaker frame B, positioned over a hopper 5 which is adapted to receive the fine sand and screenings passing through a pair of screens 6 and 7, mounted in the shaker frame B. The material is delivered onto the screens 6 and 7 by a suitable conveyor 10,

indicated in dotted lines in Figure 1 The shaker frame comprises side beams 8 and 9 movably suspended from the super frame 4 by suitable links G, each having one end pivotally connected to thesuper frame 4 and of roads, road surfaces, pavements, etc, and

as this material usually has to be of a certain fineness or grade, to meet the require ment of certain road contracts,it is desirable that the screens provided in the shaker frame B, particularly the lower screen 7, be demountable so that it may readily be removed andanotherone substituted therefor, depending upon the finenessof the material required, These screens may be constructed of wire mesh or perforated plates, and theupper.

screen 6is usually of a rather coarse mesh,

and the lower screen 7 of a relatively finer mesh. The purpose of the screen "7 is to separate the sand, which is not desirable for use as 'a' road'mate ia1,-fromfthe coarser material, the finer 'material being discharged into th'ehopper 5 while thecoarser road material is .discharged into a hopper 11, from whence this material maybe removed by suitable means not shown, to trucks oriother conveyances for distribution along the road QIlHgh-Way."

"*A f ature of this invention resides in the novel means provided for demountably securing the screen 7 to the side beams 8 and 9, whereby it may" quickly be removed from its supporting means anda'nother screens'ubstituted therefor, when necessary. Tothus demountablyjsecurethe screen ,7 to the side beams 8 and'9, a plurality of hook elements 12am; secured, in this instance, to the side beam 8 by suitable bolts13. The lower por-' I tions ofthehook elements 12 are turned in- ;ai Wardly and spaced from the bottom of the ure 4.

beam 8 to provide a longitudinal seat 14 for one side of the screen 7, as shown in Fig The opposite side of the screen? is secured to the side beam 9 bymeafns of clamping elements 15, movablysupported in brackets 16'by suitable bolts 17, Each bolt 17 is mounted in a slot 18, provided in its complementary bracket 16, whichpermits the'bolt 17 and element to be moved fromfthe position shownin Figure? to that shown in Figure 4. In Fi ure 7, the clampmg member 15 is clampingly engaged with the frame of the V screen'7. When the nuts on the bolts 17 are loosened, the clamping elements 15 may readily be moved outwardly to the position shown ii -Figure 4:, after which the screen may be lowered out of engagement therewith asindicated' by the dotted line 19 in Figure 4'. i The brackets'16 are secured to the'side beam 9 by suitable bolts 21.

The forward end of the screen 7 is sup ported upon a ledge 22, marginallyformed in one side; of a transverse plate 23, having its ends suitably secured tothe side beams 8 and 9. The forward end of the'screen is notbolted'to the ledge 22;

The rear end of the screen 7 is supported upon an off-set clamping plate 24, secured'to the crossmember 25 'of'the shaker frame B,

by suitable bolts 26. This clamping plate is notched as indicated at 27, 28, and 29 to provide clearance for the bolts provided in the frame of the screen.

To remove the screen 7 from ltlie shaker frame B, the clampingplatefl' l 'is removed from the frame, after which the bolts afife loosened, and the "clamping ele'merits {15 screen? from the shaker frame. Convenient access may be had to thebolts 26'securing' the transverse clamping plate 2451 170 the crossmember 25, and alsoto the bolts'17, securing the clampingelements '15 to the brackets 16 and screen 7. i W

V Iclaim as my invention: a p

1'. The combin ation ofa-frame comprising spaced side beams, ascreenfa plurality of inwardly lturnedhook' elements secured toone ofj-said-beams and having their lower p'ortions spaced from the bottom thereof to providea seat for the screen, means secured to said beams to provide a seat forthe forward end of said screen, aplurality of brackets se cured to the-other'side beam, eXtending'out--. wardly therefrom, and each having a clamp-- ing element slidably mounted therein and adapted toengage the opposite side of the screen, said hook elements, plate and clamp-- ing elementsco-operating to demountably Se,- cure'the screen'to said beams, and permitting removal of the screenfrom the frame without detaching any of said parts therefrom.

2. The combination of a frame having spaced side beams, a screen, means fixed to one of said beams adapted to loosely support one side of .the screen, a bracket secured to the other side beam and having a portion extending outwardly therefrom provided with a seat, a clamping element slidably mounted on said seat and adapted to engage the opposite side of the screen, said bra'ckethaving an elongated aperture in the outwardly extend- Li ing portion thereof, and a bolt carried by said clamping element,'traversing said elongated aperture and functioning to move the element into clamping engagement with said screen todemountably secure it to the beamsi 3. The .combinationof a supporting frame,

having spaced side beams, screen, a. plurality of spaced hook elements secured to one of said side beams and adapted to form a seat forone side of the screen, a transverse plate secured to said side beams and having an offset portion forming a seat for the forward end of the screen, a plurality of clamping elements secured to the other side beam and adapted to engage and secure the opposite side of the screen thereto, and a transverse plate demountably secured to the rear ends of the side beams for supporting the rear end of the screen.

4. The combination with a frame having a side rail provided on its lower portion with a flange, of a shank seated against the face of said rail and fitting the angle formed by said face and flange, said shank having a part depending below said flange and spaced therefrom to form a recess, a screen having one edge adapted to enter said recess and be supported by said shank, and means for securing said screen to the opposite rail of said frame.

5. The combination with a frame having oppositely arranged side rails of channel cross-section and provided with upper and lower flanges, of a series of shanks secured to one of said rails at intervals and formed to fit the angle between the lower flange and the web of said rail, said shanks having downwardly and inwardly turned portions spaced from the lower flange, a screen adapted to enter said space and be supported by said shanks, and means for securing the opposite side of said screen to the adjacent rail.

6. The combination with a frame having side rails and means for supporting a screen on one of said rails, the other rail having a flange formed on its lower portion against which the adjacent edge of said screen is seated, brackets secured to said rail above said flange, a plate adapted to engage the under face of said screen and hold it against said flange, and means adjustably mounted in said bracket for holding said plate and allowing it to be moved outwardly to clear said screen.

7. A support for a screen comprising a frame including spaced side members, brackets secured to one of said side members and having inwardly turned portions spaced from the bottom face of said side member whereby one side of the screen may be supported upon said inwardly turned bracket portions, brackets secured to the opposite side member of the frame and having outwardly extending portions, and horizontally disposed clamping elements mounted upon said outwardly turned bracket portions adapted to clampingly engage the opposite side of the screen, whereby the screen may be demountably secured to said support.

8. A support for a screen comprising a frame including spaced side members, brackets secured to the outer surface of one of said side members and having inwardly turned portions spaced from the bottom face of said side member whereby one side of the screen may be supported upon said inwardly 

